On your first login after your username changes, you must use "Other user" on the Windows login screen β not your existing profile tile. This guide walks you through it with screenshots.
Password stays the same.
Don't tap your existing profile tile. If you do, the login will fail. Always use "Other user" at the bottom-left of the login screen for your first sign-in.
Skip this step if your computer is already at the Windows login screen. Go straight to Step 3.
firstname.lastname@kry.se (or firstname.lastname@kry.no if you're in Norway).
After clicking "Other user", you'll see this screen. Enter your new username and existing password.
@kry.se for Sweden, @kry.no for Norway) + your existing password